This selling price is for one nylon insert Self-Locking nut. Please select option listed Size available. 

Self-locking nuts add a nylon insert that sits on top of the nut to deform on the mating thread and catch the bolt or stud. This provides a locking function that creates resistance - or primary torque - to lock the nut in place and resist vibration.

Just go to the size window above to select the size you need from the drop down menu.

Listing Size: Thread size x Thread pitch